The last time these teams met at Jeld-Wen Field in August 2012, they were propping up the rest of the Western Conference. Now, Dallas is in first in the West and all of MLS, and Portland is third in the West, with two games in hand on second-placed Real Salt Lake.

Both of these teams advanced to the quarterfinals of the Lamar Hunt U.S. Open Cup on Wednesday, shutting out their opponents. Dallas won the Texas derby against Houston 3-0, and Portland dispatched NASL outfit Tampa Bay Rowdies, 2-0.

Portland is currently on a 14-match unbeaten run in all competitions. The Timbers have lost just once this season, 2-1 to Montreal on March 9.

These teams already met once this season, playing to a 1-1 draw in Dallas on May 8.

Portland's 24 goals scored this season is tied for the best in Major League Soccer.